Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B1/00—Devices for securing together, or preventing relative movement between, constructional elements or machine parts
  • F16B1/02—Means for securing elements of mechanisms after operation
  • F16B1/04—Means for securing elements of mechanisms after operation disengaged by movement of the actuating member of the element
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
  • F16B21/06—Releasable fastening devices with snap-action
  • F16B21/07—Releasable fastening devices with snap-action in which the socket has a resilient part
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
  • F16B21/06—Releasable fastening devices with snap-action
  • F16B21/07—Releasable fastening devices with snap-action in which the socket has a resilient part
  • F16B21/071—Releasable fastening devices with snap-action in which the socket has a resilient part the socket being integrally formed with a component to be fasted, e.g. a sheet, plate or strip
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/77—Use of a shape-memory material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/97—Constructional details of connections not covered for in other groups of this subclass having differing thermal expansion coefficients

Definitions

• This invention relates to fixing and release systems.
• the invention represents an improvement in the fixing and release systems disclosed in International Patent Application No. PCT/AU99/00185 (published as WO 99/47819), the contents of which are imported herein by reference.
• a fastener was adapted to releasably fix the first and second elements and included a locking means oveable by remote activation between a locked position and an unlocked position. There was no permanent material connection between the fastener and the remote activation, means.
• a "material connection” was defined as a connection which had physical substance, i.e. substance made of matter, and excluded a connection made through energy.
• remote activation means included the use of magnetic attraction or repulsion, the use of high-frequency heating or radio f equency heating, the transmission of a message via radio or other waves, and so on.
• the invention is also based on the desire to provide a system of fasteners which can be part of an array, which can be individually addressable and which can enable an orderly, predictable way of accessing replaceable components in assemblies, for example, in order to remove a radio unit from a motor vehicle.
• the present invention finds a basis in the desire to utilise computer systems already established in many vehicles.
• controller-area networking in which modules com rmicate data on to a bus, usually requiring two wires
• LIN local interconnect network
• the fasteners of the present invention may be useful in connection with these other "On Board Diagnostic Systems”.
• shape memory materials that known as "shape memory” materials.
• Currentiy the best known of these is a shape memory alloy, predominantly or wholly made of titanium and nickel, but which may also include other material, such as aluminium, zinc and copper.
• shape memory alloy is capable of adopting one shape below a predetermined transition temperature and changing to a second shape once its temperature exceeds the transition temperature. Conversely, when the shape memory alloy cools below the transition temperature, it is capable of adopting the first shape again.
• this invention provides a fastener which includes:
• actuating means attached to the fastening element and including a material adapted to contract when activated; wherein the beam is moveable, upon contraction of the material, between an engagement position and a disengagement position.
• the fastener of this first aspect of the invention may be made of any suitable material, including plastic or metal.
• the fastener may be made of a combination of materials.
• the flexible beam should have flexural modulus which is sufficiently low to enable the actuating means to move the beam in the desired manner.
• the tensile strength of the beam should be sufficiently high that the fastener can fasten useful loads.
• the material of the beam has sufficient fatigue strength to accommodate the desired number of locked/unlocked cycles.
• the beam is made of metal, this is preferably spring steel, a beryllium-copper alloy or a titanium-copper alloy.
• the beam may be machined, cast, moulded or formed in any desirable way.
• the beam can be made of braided flexible cable.
• the engagement means preferably takes the form of a projecting wedge which can key into a corresponding recess in a wall of an element
• the engagement means may be a snap means, a rod for latching over a hook, or an aperture which can latch over a projection such as a peg.
• the engagement means may take the form of a dovetail on the beam fitting into an appropriate recess.
• the fastener of the invention can engage with an identical fastener, for example.
• the material which contracts when activated, is a shape memory material as has been discussed above.
• the shape memory material is a titanium-nickel wire which, when sufficient energy in the form of an electrical current is applied, heats to or above a temperature at which the material shrinks by about 4 to 5%.
• the flexible beam can be caused to bend away from the engagement position in which a first element is fastened to a second element, thereby releasing the elements.
• the shape memory material is permitted to cool belo the transitional temperature, in some embodiments the beam may assume the engagement position and the elements may be fastened again.
• the shape memory material once the shape memory material has caused the beam to move to the disengagement position, it can be maintained in that position for a desired length of time, possibly by being maintained in a "hold" state.
• a hold state may be established using less power (such as electrical current) than that required to move the beam from the engagement position to the disengagement position- This may be achieved, for example, by insulating the actuating means, for example, by maintaining an insulating tube around the actuating means. Such a tube may comprise or include Teflon or other insulation. If the insulation is suitable, the shape memory material may successfully maintain the beam in a disengagement position using an electrical current (or other energy), which is less than that required to move the beam to the disengagement position in the first place. Another way to reduce the amount of energy required to maintain the beam in the "hold” state in this embodiment is to provide one or more barriers to interfere with air convection.
• Shape memory alloy is known to require a relatively long time to cool - for example, as long as 4 to 5 seconds. If this is undesirable, the shape memory alloy may be covered with a heat sink material which can reduce cooling time. The use of materials such as rubber, silicone or polyurethane directly on a shape memory alloy can help reduce cooling time. This may, however, have a negative effect in increasing me amount of power required to heat the shape memory alloy. If Teflon tubing is used for insulation, as set out above, it may be desirable to place copper tubing over the Teflon tubing, since copper tubing is highly efficient at conducting heat away from the shape memory alloy and hence reducing cooling times.
• the fastener of the invention may take the form of a monostable, bistable or multistable clip.
• the flexible beam is resilient and fhe shape memory material takes the form of a titanium-nickel wire joining the flexible beam to a base.
• shrinkage occurs and the resilient beam bends to accommodate the shrinkage.
• the wire cools below the relevant temperature, it elongates.
• the bias of the resilient beam causes the monostable clip to resume the original position.
• the beam has two stable positions, one holding the beam in the engagement position and the other holding the beam in the disengagement position.
• the beam lacks any bias which would hold the beam in the engagement position.
• the titanium- nickel wire joining the flexible beam to the base.
• One wire is on one side of the beam and the second wire is on the other side of the beam.
• Each wire can be activated separately.
• the first wire When the first wire is activated, it shrinks and distorts the beam in one direction, to the disengagement position. The beam stays in that configuration when the wire cools.
• the second wire In order to move the fastener to the engagement position, it is necessary to activate the second wire by the use of suitable heat, so that the second wire shrinks and draws the fastener back to the first position.
• a bistable clip can be used in situations where it is desirable to maintain the disengagement position without having to maintain a supply of energy (such as heat).
• the actuating means is capable of moving the beam to a number of positions, for example, in incremental steps. It is within the scope ofthe first aspect ofthe invention that the fastener may be locked in the engagement position, in the disengagement position or in any intermediate position.
• the locking means may be any suitable means known in the art- By way of example, the locking means may trap the beam or engagement means or may block the 5 beam or engagement means from moving out ofthe locked position. This can be useful, for example, if the fastener ofthe invention is used to fasten a door.
• the material which contracts when activated is preferably in the form of a wire, forming a "backbone" to the beam.
• the material may take the form of a strip. In either case, the material may run along most ofthe 0 length ofthe beam or it may be fixed at or near the head o the beam and run at an angle.
• the material may be attached by any suitable means, including threadmg through an aperture or channel, screw attachment, moulding, coating, encapsulation within another material and so on.
• the material is in the form of a wire
• Connection can take place by way of crimping.
• the beam is provided with a hook at either end, the loop can be attached to the beam via the hooks, the crimping points serving as points for electrical wires to be soldered to the fastener for provision of 20 power.
• Such fasteners may be produced by injection moulding in plastic or formed from metal with simple assembly in crimping the wire into a loop and clipping it into place. It is anticipated that the cost of such a fastener would be extremely low.
• the material which contracts when activated is not limited to wire or strips.
• the material may be sprayed 25 onto the beam by sputtering or other technique.
• the energy to be applied to the material so that it may assume the disengagement position is preferably heat energy caused by application of an electric current.
• Other forms of energy may be suitable. In the case of heat energy generated by an electric current, this may be effected in any suitable way.
• the fastener may be a discrete fastener or a linearly extended fastener which can provide a continuous engagement strip.
• terminals in the base ofthe fastener may be used to connect to an electric supply.
• one or more buses may be incorporated in the fastener in order to transmit electrical energy along the length ofthe linear fastener.
• a metal wire lashing may connect one bus to another along the length of the fastener. The lashing may be integrated with the fastener.
• the beam may be attached to or integral with a base.
• fhe engagement means is located at the opposite end o the beam to the base.
• the fastener ofthe present invention can be constructed in an extremely inexpensive way, compared to other forms of fasteners.
• the fastener ofthe present invention can replace solenoids in many applications.
• the fastener o the invention may, at least in some embodiments, be regarded as a hybrid between latching and fastening. The invention is particularly useful in security situations, since all fixing can be inaccessible once the assembly is constructed.
• the fastener ofthe invention can be constructed using only two parts, the fastening element with integrated beam and engagement means being one part and the actuating means being the other. This can have substantial advantages in not only requiring fewer parts but also less assembly, lower cost and greater reliability.
• the fastener may fasten a first element to a second element and may be integral with, for example, the first element, or may be separate from it. It is an important aspect of this invention that it is possible to form the fastener integrally with or from the element.
• the fastener can be integrally moulded into a product casing, or formed from the edges of a metal panel ,
• the first element and the second element can each be chosen from a wide range, as was the case with the International Application. Also, as was the case with, the International Application, there may be more than two elements which are fixed or released. For example, one first element may be fixed to or released from a plurality of second elements; a plurality of first elements may be fixed to or released from a single second element; or a plurality of first elements may be fixed to or released from a plurality of second elements. Further, where there is a plurality of elements, these need not be identical. A plurality of first elements may differ from one another, a plurality of second elements may differ from one another.
• the fastener ofthe invention may be of one or more parts and may be integrated with one ofthe elements it is intended to fasten, or it may be attached to such an element by adhesive, by snap-fit or by other suitable means.
• the fastener ofthe present invention is capable of application in a wide number of industries.
• the fastener ofthe invention can be used to retain glass in a window or a panel within a frame or on a support.
• the fastener ofthe invention there need be no fastening means visible externally.
• the window or panel can be secure in that it may not be released unless the fastener is caused to adopt the disengagement position.
• the fastener can fix a first element (the pane of glass or the panel) to a second element (the window frame or other frame).
• Anoti er example is the fixing of a building panel to an underlying infrastructure, such as a stud.
• the fastener ofthe invention can take the form of one or more discrete locking points or a continuous locking point, such as in the linear form ofthe fastener. Multiple locking points can give added security, for example, in locking a window.
• the fastener ofthe invention is eminently suitable for use in situations where tampering or vandalising is to be prevented or discouraged.
• light fittings in public conveyances, such as trains can be secured by the fastener ofthe invention.
• These can replace the need for tamper-proof screens and other unsightly barriers.
• Other examples are as follows: access panels in buildings, for example, for alarm systems, safety equipment and so on, covers for lights in buildings, covers for traffic lights, phone boxes and parking meters and enclosures for signage systems, such as at bus shelters and on shop fronts.
• a seal or insulating material in the assembly, in order to protect the fastener from undesired temperature fluctuations.
• the fastener ofthe invention can be used to fix, for example, a first element being a closure, to a second element, being a receptacle, such as a bottle.
• the power may be supplied by a battery within the closure, or by power supplied externally from a separate power source.
• the fastener o the invention can be adapted to a wide range of applications.
• the fastener can close a flap on a mailbox, for example, being one of an array of mailboxes in a home unit building.
• insertion of an electronic access card may be required to authorise a supply of power to the fastener to cause it to be activated and allow the flap to be disengaged from the mailbox, permitting access to the mailbox.
• the fastener ofthe invention can be relatively small in size: this contributes to its usefulness in a wide variety of situations.
• a significant application for the fastener of the invention is in holding together the casings for products, allowing disassembly. It has already been set out above that disassembly is becoming increasingly more important, especially in connection with product recycling.
• the fasteners ofthe invention can provide a simple and relatively inexpensive system for assembly and disassembly. For example, consider a two-part plastic casing. One part may be relatively simple, forming a lid, while the other part may contain the fasteners ofthe invention and the supporting elecfronic system.
• the fasteners ofthe invention may be embedded into the product itself, to allow parts and subassemblies ofthe product to be removed on command. Like materials can be removed at the same time. Parts can be removed in an efficient sequence. Parts and subassemblies can be recovered quickly and without damage.
• the fastener ofthe invention can have particular application in relation to other types of assembly and disassembly.
• the assembly and disassembly of vehicles is usually complex. If it is desired to replace a part,.oftenit is necessary to undergo a complex series of steps in order to access the part to replace it Using the f stener of the present invention, especially in addressable form, it can be possible to greatly simplify the disassembly procedure by releasing only those fasteners which need to be released in order to access the part in question.
• the process can be operated via a relatively simple computer, such as a palm-sized computer programmed with the address ofthe appropriate fasteners.
• Data can be transmitted via hard wiring or by other means, such as infra-red transmission in order to cause release o the fastener in any suitable manner. Only the relevant fasteners in the dashboard fascia need to be released in order to remove the radio.
• the process can be reversed for reassembly.
• the fastener ofthe invention can be particularly useful in the building industry and in connection with large buildings which tend to have embedded "intel ⁇ igence' ⁇
• the fastener ofthe invention can be included in appropriate networks for a myriad of fastening applications.
• Even access to the intelligence system itself can be secured by use of the fasteners ofthe invention.
• the need to have lockable, sealed or tamper proof screws can be eliminated because the fastener ofthe invention can be inaccessible after fixing has taken place and can be designed for release upon a suitable command and energy application controlled by the building's intelligence.
• access to an area protected by a fastener ofthe invention can be effected via a key pad which can deliver the appropriate instruction to the power source which can then cause die fastener to deform and thus release.
• the fastener ofthe invention in intelligent form, can be used to enhance quality control and speed of assembly, as well as to provide controlled disassembly. While this aspect ofthe invention has application in a large range of areas, it is described herein in relation to a convenient example - that of vehicle assembly. Because the intelligent fastener o the invention can be addressable, individually or in groups, and in a programmed way, it is possible to replace a defective part or change a chosen option on a vehicle during assembly; the assembly line is no longer constrained in the manner presently known. As a simple example, once "options" are chosen on a motor vehicle and installed, it is usually impossible to change the chosen option - for example, by substituting a CD player for a radio in a vehicle.
• the present invention enables such an exchange to take place because it is not necessary to undergo the tedious disassembly required under prior art procedures.
• the part such as the radio
• the instruction can be embedded in software which can be carried in aportable or other computer, for example.
• a vehicle or other assembly could be constructed so that, if a part failed, the f stener holding it in place would be automatically released for access, so that the part could be replaced,
• the fastener ofthe present invention may be very simple, as well as inexpensive. Because of this, it is feasible to use the fastener ofthe invention in a "redundant" way. Redundancy can improve reliability by replicating one or more parts of the fastener any number of times. A redundant configuration can ensure that if any element fails, a redundant element can continue to enable the function of a fastener to be fulfilled. This is particularly significant in systems where there is a number of fasteners ofthe invention, such as the "intelligent" fastening systems described in greater detail below.
• the fastener itseifmay have inbuilt redundancy. For example, if the actuating means is a wire, the fastener may contain two such wires, either of which is able to operate the fastener. If one wire fails, the other can perform the necessary function in moving the beam.
• the fastener ofthe invention can be used in a redundant system.
• the International Application refers to remotely activated locking means in a fastener.
• An assembly could be made with two types of fastener available to fix or release a first element and a second element
• One type of fastener could be the remotely activatable type referred to in the International Application.
• the second type could be the fastener ofthe present invention.
• fixing and release would be effected via the remotely activated fastener.
• fixing or release could be effected via the fastener ofthe present invention.
• identical fasteners ofthe invention may be provided in duplicate, with eithe ⁇ fastener being able to function singly as the fastener in the system. If the first fastener fails, the second, identical fastener is available to perform its function.
• two separate fasteners ofthe invention may be provided, each of which singly is able to perform the fastening function.
• Each fastener has duplicated actuatmg means, either of which is able to move the beam. This configuration could withstand a single failure of a fastener or a single failure of an actuating means, and some combinations of two or more failures.
• the fastener ofthe invention may be "intelligent" or "not".
• a fastener which has no intelligence reference is made to instances o the fastener referred to above, where the energy required to convert the shape memory material may be derived from a switched bus, for example.
• the intelligent version ofthe fastener ofthe invention is preferably addressable. In this instance, the fastener will require a supply of energy (such as power) together with a supply of data.
• the fastener can be made in an intelligent form, for example, by including an embedded switch and processor. This permits the addressing ofthe fastener, on an individual basis, or as part of a group, for switching or release of a part.
• this form of "smart clip” has multiple application in a large variety of areas. It is eminently suitable for environments which already have power and, possibly, data provided. It may be used for latching, particularly where multiple diverse points are required, such as around a door perimeter or in the case of mailbox arrays as discussed.
• the fastener of the invention may be part of network. Such a network may be spread throughout a building, or throughout a motor vehicle or aircraft, for example. A plurality ofthe fasteners may be connected to a central data processorprogrammable solid state switch which, when fed with suitable data, causes one or more ofthe fasteners to receive the required amount of power to release one element from another element. In such a network, each fastener may be activated individually or in smaller or larger groups.
• the intelligent form ofthe fastener ofthe invention may have a second function which makes use o the intelligence and switching capacity ofthe fastener.
• a simple example is a vehicle which has several ofthe fasteners of the invention in intelligent form.
• the fasteners have a first function which enables the fixing and releasing of light bulbs in Ohe vehicle.
• the fasteners have a second function, which is to sense the amount of ambient light and to turn the light bulbs on or off depending on the amount of light sensed.
• One group of such fasteners may be adapted to turn on or off parking lights for the vehicle.
• Another group ofthe fasteners may be adapted to turn on or off the headlights.
• Data as to the amount of ambient light sent to a central processor activates the first fastener or the second fastener or both, according to desired criteria as to automatic switching on ofthe chosen lights.
• the network may be constructed in any suitable manner.
• the network forms a star or a daisy chain.
• a power switch or processor is located in the center ofthe star, with each ofthe fasteners being separately connected to the central power switch/processor.
• the connectors are arranged in a series, with a power source in the chain.
• a data feed may also form part of he chain, using the power cable or separate data cables.
• the fastener may include a sensor able to convey information as to the condition ofthe fastening element and the actuating means, including sensing the current state ofthe fastening element (engaged or disengaged), sensing to allow optimised control of the application of energy to the actuation means and sensing in order to report performance, degradation or impending failure ofthe fastening element or actuation means.
• a sensor may operate in a number of ways, such as by use of one or more limit switches which may employ electrical contact, magnetic, optical, capacitive or any other suitable sensing mechanism, to sense the current fastener condition (i.e., open, closed, intermediate or any one of a number of stable positions).
• One or more strain gauges or equivalent strain sensing devices which are installed on or in association with the fastener to sense position and condition and, having high levels of resolution, which can allow fine position determination and control.
• force sensors or force sensing devices may be installed on or associated with the fastener, in order to sense the force exerted on or by the fastener, and the condition ofthe fastener, with high levels of resolution and once again allowing fine position determination and control.
• Proximity sensors or eqrivalen Ositibning sensing devices may be used to sense the position ofthe fastener.
• Temperature sensors or equivalent temperature sensing devices can be used to sense the temperature ofthe fastener and, depending on the fastener type, these may be used to optimise control o the fastener and to sense condition ofthe fastener.
• Other examples of sensors will be apparent to one skilled in the art
• sensors may be used to optimise fastener control operations.
• Non- limiting examples are as follows.
• sensors in the fo ⁇ n of limit switches are used to sense movement of the beam to the disengagement position.
• Power is supplied at a high level to the actuatmg means until the disengagement position is reached, whereupon the limit switches report this position. At that stage, power can be reduced to a lower level, being still sufficient to sustain the fastener in the disengagement position.
• Operating time, energy consumption and heating is m imised.
• a strain gauge is attached to the beam.
• Power can be applied at a high level to the actuating means until the beam is deflected to the disengagement position. Detection of this position by the strain gauge enables the power to be reduced to a lower level, once again being sufficient to sustain the fastener in the disengaged position, but at the same time minimising operating time, energy consumption and heating.
• analysis ofthe degree of bending ofthe beam as a function of applied power and time will allow degradation ofthe beam to be detected and signal the need for replacement prior to complete failure.
• sensors may sense the contents (or lack of contents) of fastened elements and provide an appropriate response. For example, if fhe elements joined by the fastener are pipes, a sensor may sense presence of fluid in the pipe and refuse to disengage the pipes, even if given a command to do so. Similarly, the sensor may sense electrical current in a cable joined by the fasteners and refuse to disengage if to do so would cause a dangerous situation.
• the senor may be a local temperature probe, which can sense ambient temperature and report to an embedded processor.
• the processor could then calculate and distribute the appropriate amount of power required to activate the actuating means.
• Shape memory alloy is usually activated by a pulse of power, for example, a 150°C pulse of power. This works well if the ambient temperature is in the range of -50 ⁇ C to 75°C. However, if the ambient temperature is high, such as over 75°C, the 150°C pulse of power may cause the shape memory wire to overheat.
• the senor having sensed the ambient terrrperature, can enable the processor to work out and distribute the appropriate amount of power to the fastener, increase the operating temperature window ofthe system at lower ambient temperatures, or save power if the ambient temperature is already relatively high.
• the invention provides a fastener for use in a network of fasteners, the fastener including an address means to distinguish the fastener from the other fasteners in the network.
• the second aspect ofthe invention also provides a network of such fasteners, referred to below as a "system".
• the fastener may be the fastener according to the first aspect o the invention or any other suitable fastener.
• One example is the bolt assembly forming subject of Australian Provisional Patent Application No.2002953616.
• Another example is the fastener forming subject of Australian Provisional Patent Application No.2003901352. The content of both specifications is imported herein by reference.
• the address means is intended to enable a network system to identify the fastener, for the purpose of establishing communications and addressing commands, such as a command to cause activation of actuating means.
• the fastener may have actuating means which is any suitable actuating means and which will depend to a large extent on the nature ofthe fastener.
• actuating means are as follows: magnetic (linear solenoid), magnetic (rotary solenoid), magnetic (linear actuator), magnetic (motor), piezo-electric, electrostatic, thermal (shape memory alloy), thermal (bimetallic), thermal (state change), pneumatic, hydraulic, chemical, pyrotechnic or explosive, acoustic or ultrasonic, ionising radiation, ionising particles, lurninescent and gravitational.
• the address means may be any suitable means but preferably is capable of storage in a non-volatile manner, in order to resist corruption and intentional or unintentional over- writing or reprogramming. It is also preferred that the address means does not enable more than one fastener to have the same identity, unless there is requirement for a replacement fastener to assume the same identity as the original fastener being replaced
• the address means may comprise a serial number, a communications address or a temporary communications address, or any combination of these.
• the address means is a serial number, this is preferably a unique number which is programmed into the fastener as part ofthe manufacturing process and which consequently does not change throughout the life ofthe fastener.
• the address means is a communications address, this is preferably a communications or network address which may be assigned to the fastener at the time of installation, or when the network is configured.
• the address means is a temporary communications address
• this is an address s which may be assigned to fhe fastener on a transient basis. This may be desired, for example, where the fastener is configured in a sub-network and use ofthe full, unique address ofthe fastener during a particular session will cause excessive communications traffic and/or require excessive processing overhead during the communication session.
• the address means may enable the unique identity ofthe fastener to be stored in any 0 suitable way, and in any suitable storage device.
• the storage method is robust and uses known techniques, such as multiple redundant storage with checksum or CRC protection, reinstatement of backups on detection of errors, etc.
• the storage method includes measures to prevent unauthorised access or tampering with the unique identity. 5 Examples of storage devices are following:
• Hardwiring this includes switches, jumpers, solder blobs and soldered links.
• Non- volatile memory this includes PROM (programmable read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), Flash memory, battery backed 0 random access memory (RAM), ferromagnetic RAM and optical storage.
• Storage ofthe unique identity may be combined with the operating program code of a microcontroller.
• Semiconductor storage in this form can incorporate the unique serial number programmed during manufacture and capable of being read by a microcontroller. 5
• the address or identity of he fastener may be encrypted.
• the first example is link encryption, where each communications link in which the information may be intercepted is protected by encryption of information on that link. 0 Information may appear unencrypted or "in the clear" at communications or control nodes, and may need to be protected by other means, such as physical access control - discussed further below - at those points.
• the second example is end-to-end encryption, in which information is encrypted at its source and decrypted at its destination and does not appear "in the clear" at intermediate points in the communications links.
• both end-to-end encryption as well as transmission over individually encrypted links may be used to result in a hybrid system.
• fasteners may attach valuable items to a vehicle or attach a door to its surround so as to lock the door. Obviously in such circumstances unauthorised operation ofthe fasteners could allow theft ofthe valuable items or intrusion through the door to occur.
• file encryption is one way to prevent unauthorised entry into a fastener system, there are other ways of controlling access. Some non-limiting examples are set out below.
• Physical access to a system arid its elements may be prevented by physically isolating the system or making it difficult to locate.
• wiring for the system can be disguised within the loom of a vehicle.
• spread spectrum wireless communication techniques can be used to hide radiated signals amongst radio noise. Use of spread spectrum wireless links or other communications methods, such as optical fibres, can make it difficult to intercept, modify, disrupt or jam commands or commxmications to the system.
• secure methods of identification may be used.
• biometric information techniques may be used to identify authorised personnel and/or systems.
• Electronic security certificates may be required to authorise access by computer based systems.
• Valid access may require confirmation by personnel or systems by a bi-directional handshake and identity confirmation process, or by such measures as call-back to an authorised telephone number or a network address, for example.
• access to and control of fasteners may require the operator or control system to take part in a dialogue with a master control/database for a specific access code, in order to allow control ofthe fastener.
• a master control/database for a specific access code
• the access code and fastener operation may be recorded in a time stamped log stored by the master control/database, by the fastener itself or by intermediate system elements. Retrieval of such logs can permit analysis for audit tracking purposes.
• each activating means may actuate one or more fastening elements.
• the system preferably includes a control means for controlling actuation of the actuating means, typically by energy from an energy source.
• Each control means may control one or more of he actuation means.
• system ofthe invention includes an intelligent controller device for controlling the control means, and, through it, the actuating means, typically in response to an external stimulus.
• Each intelligent controller device may control one or more control means.
• the energy source may include local storage of energy, such as in a battery, or externally applied energy, or a combination of both.
• the system may include a sensor, which has already been discussed above and which also applies to the second aspect ofthe invention.
• the system may further include an external sensing means for determining and reporting the condition of external elements, for example, relating to an element which is engaged by the fastener and the engagement condition.
• the system may include status indication means (such as an LED or an audible signal), to indicate the current condition ofthe fastener or the external sensing means and/or any other aspect ofthe system.
• status indication means such as an LED or an audible signal
• system may include communication means for enabling an external device or system to communicate with the fasteners ofthe invention in the system, both for control and for status reporting functions.
• the system of he invention includes one or more fasteners ofthe invention together with one or more control means, one or more sensors, an energy source, an intelligent control device, a status indicator and an external sensing means.
• a plurality of fastener systems as per the last mentioned preferred embodiment is networked with one or more optional communications concentrators, one or more intelligent control units and one or more master control/database units. Examples of these are given below in connection with the drawings.
• the fasteners ofthe invention can provide faster and more secure (because authorised) access to parts and subassemblies of products or equipment for the purposes of repair, replacement or maintenance.
• the fasteners can provide a significant saving in labour, since they can reduce the average time for repair. They can also provide a cost effective and secure method of access to internal components.
• the fasteners can reduce the need for skill, because the process of assembly and disassembly can be directed by a computer.
• Areas of application for product servicing and maintenance include those of computer components - for example, fastening a CD drive or a mother board to a housing; printer cartridges; retaining batteries - for example, on a power drill; automobile parts - for example, radio, air conditioning, interior panels, fuel cap release; and access panels on machinery and other equipment, such as forklifts. Further application may be for access to "public equipment". This has already been discussed and examples given of access panels in buildings, covers for lights, signage systems, etc.
• the fasteners ofthe invention may also provide relatively inexpensive electronic locks.
• the fasteners can be manufactured at a very low cost compared to solenoids or other conventional means of electronic locking. As a result, it may now be feasible to provide electronic locking, whereas, before now, cost would have been a prohibiting factor. Examples are: mailboxes, windows, cabinets, medicine cabinets and tool boxes. It will be recalled that the use of fasteners o the invention for electronic locking with such products can also provide for additional benefits of an intelligent system, which can report on history of access and activation by environment and which can also allow for encryption.
• the present invention provides a system for controlling a process of assembly for producing products and this forms an aspect o the present invention. Accordingly, this invention provides, in a process for producing product, the process including a plurality of steps in which a first element is releasably fixed to a second element, the use ofthe fastener ofthe present invention to releasably fix the first element and the second element. In the method ofthe invention, it is preferred that most, if not all, ofthe fixing is carried out by means ofthe fasteners ofthe invention.
• the invention also provides a computer system programmed to perform the process of the invention.
• the computer system can include hardware and/or software.
• the hardware can be designed to be plugged in to a suitable port in the assembly, or parts of it. Alternately, the hardware may be designed to transmit data in a wireless manner, as is known in the art.
• the software preferably includes input data relevant to the location and function of each programmable fastener and interrelationship ofthe fasteners with each other, as well as means for enabling the computation ofthe most efficient manner of release ofthe fasteners to achieve a purpose.
• the system also preferably includes output means to guide, question or instruct a user in order to achieve the desired purpose.
• the system also preferably includes means for activating the relevant fastener of the invention.
• the system ofthe invention requires the software to be able to interact with the relevant fastener and optionally cause activation ofthe fastener.
• the system of the invention can first diagnose a problem and report on it. Thief Description ofthe Drawings
• Figures 1 and 2 show in side view a simple form of a first embodiment ofthe first aspect of the fastener of the invention
• FIG 3 shows part ofthe fastener of Figures 1 and 2;
• Figures 4 and 5 show a second embodiment ofthe first aspect ofthe fastener ofthe invention
• Figures 6 to 8 show a third embodiment
• Figures 9 to 12 show a fourth embodiment
• Figures 13 to 15 show a fifth embodiment
• Figures 16 to 18 show a sixth embodiment
• Figures 19 to 21 show a seventh embodiment
• Figures 22 to 24 show the embodiment of Figures 19 to 21 formed from an element;
• Figures 25 to 27 show an eighth embodiment;
• Figures 28 and 29 show a ninth embodiment
• Figures 30 to 34 show the ninth embodiment of Figures 28 and 29 in situ
• Figure 35 shows a linear form of an embodiment similar to that in Figures 1 to 3;
• Figures 36 and 37 show the embodiment in Figures 9 to 12 in situ;
• Figure 38 shows a tenth embodiment;
• Figures 39 and 40 show an eleventh embodiment
• Figures 41 to 43 show a twelfth embodiment
• Figures 44 to 47 show a thirteenth embodiment
• Figures 48 and 49 show an embodiment similar to that in Figures 44 to 47;
• Figures 50 and 51 show a further embwhment of a fastener with redundancy;
• Figures 52, 53, 54 and 55 show an embodiment used for engaging a door and with the ability for locking the door;
• Figures 56 to 61 show a different embodiment ofthe fastener ofthe invention used for door locking
• Figures 62 and 63 show an embodiment ofthe fastener in connection with limit switches
• Figures 64 and 65 show an embodiment ofthe fastener with a strain gauge
• Figures 66 and 67 show an embodiment similar to mat in Figures 64 and 65 but with two strain gauges.
• Figures 68 and 69 show an embodiment in connection with actuating mechanisms
• Figures 70 and 71 show a further embodiment in connection with actuatmg mechanisms
• Figure 72 is a block diagram of an embodiment of a fastener according to the invention.
• Figure 73 is a block diagram for operating fasteners in a redundant system;
• Figure 74 is a block diagram showing a network of fasteners
• Figure 75 is a block diagram showing a fo ⁇ n of encryption.
• Figure 76 is another block diagram showing a different form of encryption
• Figure 77 is a block diagram dealing with address means; and Figure 78 is a block diagram relatin to use of fasteners and network ofthe invention in a motor vehicle.
• this embodiment is made of moulded plastic and the actuating means is a smart memory alloy wire.
• the fastener 10 is shown in side elevation and has, formed integrally, flexible beam 12 having at one end engagement means 14 and at the other mounting block 1 .
• Shape memory alloy wire 18 forms a loop passing through channel 20, with both ends o the loop secured in block 16.
• This fastener is provided in a pre ⁇ cambered form, as illustrated in Figure 3.
• the correct tension is provided to wire 18, as shown in Figure 2, where fastener 10 is in the engaged position.
• Figure 1 shows the disengaged position, after wire 18 has contracted.
• This embodiment could also be made from moulded metal.
• this second embodiment which also shows the fastener in side elevation, is similar to the first embodiment and the same numbers are used.
• the difference between the respective embodiments is the tMckemng of beam 12 at 22 where beam 12 joins block 1 .
• the purpose of this thickening is to strengthen beam 12 to improve the structural and long-term integrity ofthe fastener.
• FIG. 6 A third embodiment is shown in Figures 6 to 8, Figures 7 and 8 show the fastener in side elevation while Figure 6 is a rear elevation.
• the same numbers are used for parts having the same function.
• Fastener 10 includes flexible, beam 12 and engagement means 14.
• the actuating means 18, instead of comprising shape memory alloy wire as in the previous embodiments, consists of shape memory alloy coating 18 running along the rear of beam 12.
• Fastener 10 is shown in the engagement position in Figure 8 and in the disengagement position in Figure 7, after contraction of shape memory alloy coating 18.
• Figures 9 to 12 differs from those in Figures 1 to 3 and 4 to 5 in the manner of attachment ofthe actuatmg means.
• Figure 9 is a rear view, Figure 10 a side elevation, Figure 11 front view and Figure 1 a top view of fastener 10.
• fastener 10 has flexible beam 12 integral with engagement means 14 and mounting block 16.
• flexible beam 12 is located at the rear of mounting block 16, rather than at the front as in Figures 1 to 3,
• Shape memory alloy wire 18, made of titanium/nickel, passes through channel 20 in fhe same way as in the first embodiment.
• wire 18 is held on block 16 by wire attachment screws 24. Power is fed to wire 18 through power cables 26 which emerge from the front of block 16 as shown in Figures 10 and 12. For convenience, power cables 26 have been omitted from the front view n Figure 11 ,
• the embodiment in Figures 13 to 15 mainly differs from the previous embodiments n that, instead of mounting block 1 , it has a clip style base 28 with flexible locking members 30, designed to snap into a part (not shown).
• flexible beam 12 is located approximately in the centre of clip style base 28.
• Shape memory alloy wire IS is secured in base 28.
• the embodiment in Figures 16 to 18 is moulded integrally with an element for which it is providing the attaohment.
• the element, which is partly shown at 32, may be, for example, part of a plastic casing to hold a mobile phone.
• Flexible beam 12 is integral element 32 and can include two hooks 34. Hooks 34 secure shape memory alloy wire 18, which is crimped at 36, to insulating wire, such as nylon wire, 38.
• Figure 16 shows fastener 10 in rear view, while Figure 17 is a side view in the engagement position and Figure 18 is a side view in the disengagement position.
• FIG. 19 is a rear view and Figures 20 and 21 are side views ofthe fastener in this embodiment.
• Fastener 10 has been integrally formed from sheet metal, as will be explained in relation to Figures 22 to 24.
• Fastener 10 has beam 12, at one end of which is located engagement means 14.
• engagement means 14 At the rear of engagement, means 14 is hook 40.
• Shape memory alloy wire 18 extends from hook 40 to lower hook 34, being suitably insulated at 32.
• wire 18 forms a loop around hook 40 and 34.
• Figure 22 is a plan view and Figure 23 a diagrammatic end view of a sheet of metal with which fastener 10 is formed, for example, by stamping.
• fastener 10 is formed, for example, by stamping.
• FIG 23 there are several fasteners 1 formed in conjunction ith sheet 44 and spaced at intervals to enhance fastening efficiency.
• FIG 24 is an enlarged view ofthe fastener 10a shown in Figure 23,
• FIG. 25 to 27 is a bistable fastener, 50.
• Figure 25 is a rear view
• Figure 26 is a side elevation in the engaged position
• Figure 27 is a side elevation in the disengaged position.
• fastener 50 is formed from sheet metal.
• fL&xibh beam 12 includes integral spring clip 36.
• Fastener 50 is bistable with the beam having two stable positions. It has two smart memory alloy wires, 18a and 18b.
• Wire 1 Sa which is shown in the contracted form in Figure 26, moves fastener 50 in the engaged position.
• Wire 18b which is shown in the contracted form in Figure 27, moves fastener 50 in the disengaged position.
• the embodiment in Figures 28 to 34 is a wedge-style fastener 52.
• the embodiment in Figures 28 to 34 engages through co-operation of he wedge shape ofthe flexible beam with catches shown in Figures 30 and 31.
• fastener 52 has flexible beam4& which tapers from a wide part 54 to base 56.
• the shape ofthe taper between wide part ⁇ 54 and base 56 is complemented by the shape of catches 58, as can be seen by Figure 30.
• Figure 28 shows fastener 52 in the locked position in side elevation
• Figure 29 is a side elevation showing the unlocked position
• Figure 3 is a rear view of fastener 52 engaged with an element 60, fastener 52 being integral o attached to element 62.
• Figure 31 shows element 60 without fastener 52 in osition ⁇ nd
• Figure 32 shows fastener 52 attached to element 62, without element 60.
• Figure 33 is a sectional view taken along the lines A-A in Figure 31.
• Figure 34 is a sectional view taken along fhe lines B-B in Figure 31, In the engaged position as shown in Figure 28, fastener 52 holds element 62 in engagement with element 60, by engagement of fastener 52 with catches 58, As shown in Figure 29, contraction of shape memory alloy wire 18 draws flexible beam 48 out of engagement with catches 58, thus enabling separation of elements 60 and 62.
• Fastener 64 in Figure 35 is a linearly extending fastener, in'contrast to the discrete fasteners in the previous embodiments.
• Fastener 64 includes flexible beam 12 and engagement means 14, flexible beam 12 being integral with mounting block 16 which in this embodiment both form a strip.
• Fastener 64 may be any desired length.
• Shape- memory alloy wire 18 is lashed along the length of fastener 64.
• Fastener 64 is especially suitable for providing a continuous fastener for a door or window, for example. Referring now to Figures 36 and 37, these show fastener 10 of Figures 9 to 12 inside a product.
• Fastener 10 is shown attached to element 66, 'being the base of aproduct case.
• Fastener 10 is attached by adhesive to base 66.
• the product case includes lid 68 (the second element) which has integral with it a wedge-shaped catch 70.
• FIG 38 shows a tenth embodiment, in which two fasteners 10 are designed to engage each other. Each fastener 78 is formed integrally with part of a product casing.
• Fastener 10b is moulded integrally with casing part 72a, while fastener 10c is moulded integrally with casing part 72b, In order to disengage the engagement means 14b and 5 14c, each fastener needs to deflect only half as much as normal and therefore flexible beams 12 can be made stiffer.
• the embodiment in Figures 39 and 40 has a flexible beam 12 with, two engagement means l4d and 14e.
• fastener 78 is used to hold together two panels, 74 and 76.
• Fastener 78 is preferably made in strip form so that it extends for substantially the o length of panels 74 and 77.
• Flange 80 serves to disguise the joins between panels 74 and 76.
• Figure 39 shows fastener 78 in the engaged position
• Figure 40 shows fastener 78 in the disengaged position, after shape memory alloy wire 18 has been heated sufficiently to contract Channels 82, into which engagement means 14D and 14E fit in s the locked position, can be best seen in Figure 40.
• Figure 41 is a rear view and Figures 42 and 43 side elevations of this embodiment, which shows the shape memory wire encapsulated in rubber.
• Fastener 10 has beam 12 integral with mounting block 16.
• Power cable 26 is in communication with shape memory alloy wire 18.
• Shape memory wire 18 and the rear 0 of beam 12 is covered in rubber 84.
• the rubber covering 84 protects shape memory wire 18 from the environment It also works as a heat sink to cool wire 18 more quickly.
• rubber 84 provides a restoration force to beam 12, helping to prevent "creep".
• Figures 44 to 47 show an embodiment of a bistable fastener 86.
• Figure 44 is a rear 5 view
• Figure 45 is a side elevation in the disengaged position
• Figure 46 is a side elevation in the engaged position
• Figure 47 is a side elevation ofthe fastener showing a slig t bias towards the engaged position when the fastener is relaxed. This is to counteract any tendency of fastener 86 to disengage under load.
• fastener 86 has a 30 sputter coating 88 of shape memory alloy. This sputter coating is applied both to the front and rear of flexible beam 12, in order to form a bi-stable fastener.
• the coating will contract and the beam will move to the position shown in Figure 45. It will remain in that position until the coating on the front of beam 1 is subject to heat through power, 35 when beam 12 will move towards the position shown in Figure 47.
• engagement means 14 encounters the required engaging surface (not shown), beam 12 will in fact be in the position shown in Figure 46, although being biased towards the position shown in Figure 47,
• fastener 86 in Figures 48 and 49 has a shape memory alloy sputter coating on fhe front and rear of beam 12,
• fastener 86 in the embodiment in Figures 48 and 49 includes sensor 90.
• Fastener 86 and sensor 90 are attached to base 66 of a product cover. Engagement means 14 engage with catch 70 which is integral with Hd 68. If an attempt is made to o force lid 68 away from base 66, engagement means 14 will tend to move off catch 70.
• Sensor 90 senses this movement and counteracts it by causing the actuation of smart memory alloy SS on the front of beam 12 to contract.
• Sensor 90 senses this movement and counteracts it by causing the actuation of smart memory alloy SS on the front of beam 12 to contract.
• FIG. 50 and 51 has a redundant actuation mechanism.
• Fastener 10 has two shape memory wires 18 and 19. Either wire 18 or 19 can move beam 12 to the disengaged position, If wire 18 fails, wire 19 can be activated so that the fastener 10 can still operate, o
• Figures 52 to 55 show an embodiment where the fastener o the invention is used to engage a door and the assembly has the facility to lock the fastener into position. The locking arrangement can be supplied by an embodiment ofthe fastener ofthe invention.
• Figures 52 and 53 are sectional views through a door jamb 94 with Figure 52 showing the fastener in the engaged and locked position and Figure 53 showing the fastener in 3 the disengaged and unlocked position.
• Figure 54 is a longitudinal section, showing an embodiment ofthe fastener acting as a locking block
• fastener 10 is located in jamb 94. Engagement means 14 engages channel 82. Channel 82 extends for substantially the length of door 96. Fastener 10 extends linearly, in a similar way, so as to make continuous contact with channel 82.
• locking block 98 has been moved into position behind engagement means 14. In this configuration, even if wire 18 is activated to contract, engagement means 14 cannot be pulled out of channel 82, because of physical contact with locking block 98. In order to release door 96, it is necessary to first withdraw locking block 98 as shown in Figure 53 so that contraction of wire 18 can move beam 12 and engagement means 14, so that channel 82 is cleared.
• Locking block 98 is in tact the engagement means in a bistable fastener 100, which has an integrated clip 36, similar to the embodiment in Figures 25 to 27.
• Figure 54 shows locking block 98 in the locked position, as in Figure 52.
• fastener 100 Because fastener 100 is bistable, it will remain in the position shown in Figure 55 until wire 18a is activated in order to again lock block 98.
• fasteners 100 are discrete rather than linearly extending, since it is not necessary to lock the whole length of engagement means 14.
• locking block 98 is capable of assuming three positions. The first is the locked position shown in Figure 56. The second is the unlocked position shown in Figure 57 and the third, as shown in Figure 58, is a position in which locking block 98 locks engaging means 14.
• Engaging means 14 has for this purpose aprojection 102 which is engaged by a cutaway 104 on locking block 98 for this purpose.
• Figures 62 and 63 show how the engaged or disengaged state of a fastener may be sensed by limit switches.
• limit switch 106 When fastener 10 is in the engaged state shown in Figure 62, limit switch 106 is turned on.
• limit switch 108 When fastener 10 is in the disengaged position, as shown in Figure 63, limit switch 108 is turned on and switch 106 is off.
• Figures 64 and 65 illustrate the use of a single strain gauge to sense and fastener position.
• Strain gauge 110 is attached to the back of beam 12 ( Figure 64 being a side elevation and Figure 65 being a rear view). Strain gauge 110 permits the position ofthe beam 12 to be determined with high resolution throughout its travel, typically 256 steps or more.
• FIG. 66 and 67 The embodiment in Figures 66 and 67 is similar, except that two strain gauges are used, 1 a and 110b. Differential measurement between the strain gauges allows the position of beam 12 to be determined throughout its travel, with high resolution. Common mode measurement allows linear extension or compression of he fastener to be measured, and hence axial loading on the fastener to be determined.
• Figures 68 and 69 show a design in which wire 18 is attached to circuit board 112 and to a conductive base 113 for earth return connection .
• a single wire 114 carries power and superimposed communications and makes connection via an insulation displacement connector 116.
• fastener 10 clips into base 118.
• Wire 18 connects to printed circuit board 112, in this case integrated into fastener 10.
• Base 118 accommodates a four-way ribbon cable 120 which runs through base 118 and which is crimped into place. Cable 120 carried power and communication, with connection to fastener 10 by electrical contacts 122.
• Figure 72 is a block diagram of an intelligent fastener configuration, applicable to either aspect ofthe fastener ofthe invention. It is self-explanatory.
• Figure 73 is a block diagram representing a system for control of one or more redundant fasteners. Two intelligent controllers, each linked by two independent communications links, can mdividually control each fastener. In this way, full functionality can be maintained even in the event of failure of either a controller or a cc»mmunications channel.
• the block diagram in Figure 74 represents a system of fasteners. Each intelligent fastener is as shown in Figure 72.
• the communications concentrator which is an optional element, provides a mechanism for partitioning system complexity; eg, by providing an interface between a relatively costly-to-implement radi frequency network and an inexpensive RS-485 network which interconnects a number of he fasteners via a subnetwork.
• the subnetwork may use any communications which may also be useful for the intelligent fastener, such as uni-dfr ectional, bi-directional, full duplex, half duplex, simplex, point-to-po ⁇ t, network, asynchronous and synchronous, via such .techniques as electromagnetic radiation, radio (AM or FM), magnetic coupling, low frequency RF, microwave radio, spread spectrum radio, light (visible, infrared), optical fibre, electrical (wire, cable) or sonic (ultrasonic, audible or infra- sound).
• AM or FM electromagnetic radiation
• FM magnetic coupling
• low frequency RF radio
• microwave radio microwave radio
• spread spectrum radio light (visible, infrared)
• optical fibre electrical (wire, cable) or sonic (ultrasonic, audible or infra- sound).
• the intelligent control unit may be a discrete device, an integrated circuit, a microcontroller, a microcomputer, a programmable logic device, a hybrid integrated circuit, an application specific integrated circuit, a printed wiring assembly or an embedded PC.
• Th? optional sensing mechanism may be binary, multi-state or linear and operate by any ofthe following techniques: electrical (switch, contact, strain gauge, piezoelectric, piezo-resistive, magneto-resistive, resistive), magnetic/Hall effect, capacitive, optical acoustic ultrasonic or mechanical.
• the status indication may be optical, acoustic or mechanical.
• the control mechanism may also be binary, multi-state or linear. It may operate by techniques such as electrical (switch, relay/contactor, semiconductor, transistor, FET, thyristor, mechanical (lever, valve, piston) or biological (human or animal).
• the energy source and optional storage may be local, external or a combination, using a technique such as primary or secondary cell or battery, mains derived power, capacitor or supercapaoitor, electromagnetic radiation (RF or light), inductive-coupling, acoustic, chemical, fuel cell, gravity, mechanical, kinetic or biological-
• FIG. 75 this illustrates a form of link encryption, in which each communications link where the information (address data) may be intercepted is protected by encryption of information on that link.
• Figure 76 shows a form of end-t-end encryption, where information is encrypted at its source and decrypted at its destination.
• Figure 77 shows storage of a unique identity for a fastener, using a microcontroller- based intelligent controller which incorporates internal program code memory programmed with a unique serial number during manufacture. Also included is an EEPROM which stores a network address programmed as part of installation and co nrission g. Each of these is stored redundantly with checksum protection.
• the block diagram in Figure 78 embodies many o the concepts ofthe invention.
• the system shown consists of a fastening system for a car radio which is housed behind a fascia which must be removed before the radio can be removed or installed.
• the fascia and radio are each retained by multiple fasteners similar to those shown in the early embodiments, above.
• the fascia is retained by intelligent festener A which controls three "slave" fasteners wired in series/parallel combination.
• the radio is retained by intelligent fastener B which controls one slave fastener wired in series with the fastener.
• the intelligent fasteners have external sensing switches to determine whether or not the item attached by the fastener is in place. Power for fastener electronics and actuators is derived from the vehicle electrical system.
• the handheld PC in the intelligent control unit runs custom software and the unit can report the installation or otherwise ofthe radio and fascia and can guide the operator through a step-by-step installation procedure.
• the database in the master control unit may contain records relating to vehicles being serviced by the system.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
• Connection Of Plates (AREA)
• Clamps And Clips (AREA)

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Cited By (31)

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• 2002
  • 2002-06-19 AU AUPS3123A patent/AUPS312302A0/en not_active Abandoned
• 2003
  • 2003-06-19 EP EP03729701.7A patent/EP1534964B1/de not_active Expired - Lifetime
  • 2003-06-19 CA CA002489857A patent/CA2489857A1/en not_active Abandoned
  • 2003-06-19 CN CN201110308976.1A patent/CN102506040B/zh not_active Expired - Fee Related
  • 2003-06-19 CN CNA038187345A patent/CN1675473A/zh active Pending
  • 2003-06-19 JP JP2004514418A patent/JP2005530115A/ja active Pending
  • 2003-06-19 EP EP10186329A patent/EP2284404A3/de not_active Withdrawn
  • 2003-06-19 WO PCT/AU2003/000759 patent/WO2004001235A1/en active Application Filing

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